Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in goodwill by reportable segment

The changes in the carrying amount of goodwill for the year ended December 31, 2016 and the nine months ended September 30, 2017 are as follows:

($ in millions)	Total
Balance as of January 1, 2016	$	306.5
Foreign currency impact		(6.9	)
Balance as of December 31, 2016		299.6
Foreign currency impact		18.1
Balance as of September 30, 2017	$	317.7

Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill

The gross carrying amount, accumulated amortization and net book value of the Company’s intangible assets other than goodwill at September 30, 2017 and December 31, 2016 are as follows:

	September 30, 2017							December 31, 2016
($ in millions)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Trademarks and tradenames	$	98.6	$	—		$	98.6	$	92.4	$	—		$	92.4
Customer relationships		10.5		(8.5	)		2.0		10.3		(7.8	)		2.5
Patents		30.4		(29.4	)		1.0		28.5		(27.4	)		1.1
Engineering drawings		10.7		(10.6	)		0.1		10.0		(9.9	)		0.1
Distribution network		19.3		(0.1	)		19.2		18.0		—			18.0
Other intangibles		0.3		(0.3	)		—		0.2		(0.2	)		—
Total	$	169.8	$	(48.9	)	$	120.9	$	159.4	$	(45.3	)	$	114.1